| 摘要 |
1414488 Disproportionation catalysts BP CHEMICALS INTERNATIONAL Ltd 16 July 1973 [17 Aug 1972] 38411/72 Heading B1E [Also in Division C5] Alumina-supported rhenium heptoxide catalysts are made using alumina which has been digested with an aqueous solution of an ammonium phosphate and then separated therefrom. Preferably the finished catalysts contains up to 16 wt% of phosphate ion and the alumina used is γ-alumina derived from boehmite obtained by hydrolysis of aluminium alkoxide which is the oxidation product of a Ziezhur-type reaction of an aluminium alkyl with an alpha mono-olefin. The catalyst may be reactivated by heating. In the examples calcined boehmite is digested with aluminium nitrate, separated therefrom, digested with (NH 4 ) 2 HPO 4 , wash, dried, calcined, impregnated with ammonium perrhenate, dried and activated in air. After use it is reactivated at 580‹C. |
